基于PMW三相并网逆变器矢量解耦控制系统的设计

三相PWM逆变器是风力发电并网系统的主要部分，开发高性能的逆变器控制策略已成为研究的重点。对于相位幅值逆变控制电路，为电压单环结构，响应速度慢，且网侧存在直流电流偏移量，瞬态时，输入电压滤波器会出现振荡且负载电流会发生畸变。提出一种矢量解耦控制策略，对直流侧电容电压的平衡进行分析与补偿设计，给出矢量解耦控制算法的软件流程。实验结果表明，该控制策略能获得较好的控制性能，并能实现单位功率因数校正。该逆变器运行效率高，可靠性好，完全满足并网要求。

Design of PWM Three-phase Inverter with Vector Control System Based on Decoupling

The three-phase PWM inverter is the main part of the wind power grid system, inverter control strategy of the development of high performance has become the focus of research. The phase and amplitude control circuit of inverter and voltage single loop structure, response speed is slow, and network side exist direct current offset, transient, input voltage filter will appear oscillation and load current distortion. A vector decoupling control strategy is proposed to analyze the balance of the capacitor voltage in the DC side, and the software flow of the vector decoupling control algorithm is presented. Experimental results show that the control strategy can achieve a good control performance, and can achieve unity power factor correction. The inverter high running efficiency, good reliability, fully meet the requirements of the grid.